Michael Girgenti claims he could be the baby daddy of Kourtney Kardashian‘s son, Mason, but in a video clip obtained exclusively by RadarOnline.com, a lie detector test reveals that Michael never even slept with Kourtney!

In a taped segment for TheTrisha Goddard Show set to air on September 17, the host subjected Michael to a bevy of questions regarding his relationship with Kourtney and paternity of the boy she had with long-time boyfriend Scott Disick.

“She was a wonderful lover and very beautiful. We didn’t use any protection — she didn’t ask me about it, and I was too caught up in the moment to think about it,” Michael told Star magazine in an exclusive interview about his relationship with Kourtney.

“After the news broke last August that she was pregnant and I did the math, I started to think, ‘That kid could very well be mine.’ I’ve sent Kourtney emails over the winter, saying we need to talk about it — but she hasn’t replied. Now it’s to the point where I flat out just need to know if that’s my son.

“In the end, it’s all about doing right by the boy — and I would be the best father I could be if he really were mine.”

Michael went so far in his effort to prove paternity of Mason as to release images of himself as a child earlier this month, daring the first family of reality TV — and the public — to compare the “spitting image” resemblance to three-year-old Mason.

For Michael’s full interview and lie detector test results, tune in to The Trisha Goddard Show on September 17.